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Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
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A microchip laser source with stable intensity and frequency used for self-mixing interferometry.

Shaohui Zhang1, Shulian Zhang1, Yidong Tan1

  • 1The State Key Lab of Precision Measurement Technology and Instrument, Department of Precision Instruments, Tsinghua University, Beijing 100084, China.

The Review of Scientific Instruments
|June 3, 2016
PubMed
Summary

We developed a stable laser source for self-mixing interferometry. This robust system accurately measures non-cooperative targets with high frequency and intensity stability.

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Area of Science:

  • Optics and Photonics
  • Laser Technology
  • Interferometry

Background:

  • Accurate measurement of non-cooperative targets is crucial in various industrial and scientific applications.
  • Existing laser sources for self-mixing interferometry often lack stability and robustness against environmental factors.
  • Developing a compact and stable laser source is essential for advancing self-mixing interferometry techniques.

Purpose of the Study:

  • To present a stable and robust laser-diode (LD)-pumped-microchip laser (ML) source for self-mixing interferometry.
  • To enhance the measurement capabilities for non-cooperative targets.
  • To achieve high frequency and intensity stability for improved displacement accuracy.

Main Methods:

  • Simplified pump light coupling for polarization and intensity robustness.
  • Utilized thermal frequency stabilization for both LD and ML.
  • Characterized laser linewidth, coherent length, and measurement range.

Main Results:

  • Achieved a stable 40 × 40 × 30 mm(3) laser source.
  • Obtained frequency stability of approximately 1 × 10(-7) and short-term intensity fluctuation of 0.1%.
  • Demonstrated a theoretical displacement accuracy of 10 nm over a 0.1 m range and a 6 km measurement range for self-mixing interference.

Conclusions:

  • The developed laser source is stable, robust, and suitable for self-mixing interferometry.
  • The system enables accurate measurement of non-cooperative targets.
  • The laser source has been successfully integrated and tested in a self-mixing interferometer system.